Mold form for concrete work



7 Nov. 4 4.1.924. I f 1,514,245

' N. F.-AMBUR$EN MOLD foRMFoR CONCRETE WORK Filed Oct. '7, 191 9 2sheets-sheen? INVENTORVQ BY 1 Y rm, Arm/was Nov. 4, 1924. 1,514.245

N. F. AMBURSEN MOLD FORM FOR CONCRETE WORK Filed 001;. '7, 1919 2Sheets-Sheet 2 INVENTOR QVA-Q BY" Z 7 ATTORNEY Patented Nov. 4, 1924.

PATENT OFFICE.

NILS F. AMBURSEN, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO UN I-FO'RMCOM- PANY, A CORPORATION OF MASSACHUSETTS.

MO'LD roam For. ooncnnrn WORK.

Application filed October 7, 1919. Serial No. 329,066.

To all whom it may concern:

Be it known that I, NILs F. AMBURSEN, a citizen of the United States,residing at Pittsburgh, in the county of Alleghenv and State ofPennsylvania, have invented certain new and useful Improvements in MoldForms for Concrete fork, of which the following is a specification.

This invention relates to mold forms for concrete work, particularly toforms adapted for the construction of floors or ceilings.

One of the primary objects of my invention resides in the provision ofan improved form apparatus of the pan type in which the pans are selfsupporting and the structure otherwise simplified.

Another of the objects of my invention resides in the provision of animproved form, the major portions of which may be taken down acomparatively short time after the concrete has been poured whereby theinitial lant investment is materially reduced and it is possible tocarry out the work expeditiously with a minimum amount of equipment.

Another object of my invention resides in the provision of improved formapparatus of the character specified in which the parts may be readilyassembled and taken down.

The foregoing, together with such other objects as may hereinafterappear, or are incident to my invention, I obtain by means of aconstruction, the preferred embodiment of which I have illustrated inthe accompanying drawings, wherein Figure 1 is a longitudinal sectionthrough my improved form as applied to the construction of a floor orceiling; Figure 2 is an enlarged section taken on the line 2-2 of Figure1; Figure 3 is a. longitudinal section similar to Figure 1, illustratinga modification of my invention; Figure 4 is an enlarged section taken onthe line H of Figure 3; Figure 5 is an enlarged fragmentary sectiontaken on the line 5-5 of Figure 3; and Figure 6 is a sectional viewillustrating how the form is adapted for the construction of joists orbeams of varying depth.

Heretofore in joist floors or ceilings,,it has been customary to moldthe bottom of the joist with channels or similar members which aresupported on the false work or shoring, such channels, in addition toconstituting a portion of the mold, serving distance by means of fillerstripswhich in the construction shown in Figures 1 and 2 take the formof channels 9, preferably coextensive in length with the pans. Thefiller strips also serve to constitute the bottom of the joist mold, andin the construction shown in Figures 1 and 2 they are supported atsuitable intervals by such means as the blocks 10, which in turn aresupported from portions of the shoring or false work, as Wlllhereinafter appear. In erection, the sides of the pan are clampedagainst the filler strips 9, to which end I provide a plurality of ties11 which are adapted to be passed through apertures formed in the sidesof the pans immediate-.- ly above the flanges 8.. As shown in Figs. 1and 3, the ties 11 are of plate form, and the mold side apertures forreceiving them are in the form of vertical slots. The ties 11 are alsoapertured to receive keys 12 which take against the sides of the pans asillustrated in Figure 2, clam ing the same against the filler strips 9.T e filler strips and ties are so proportioned that when the parts areassembled in the position shown in Figure 2, the flanges 8 will bespaced apart in an amount sufiicient to clear the longitudinallyextending mold support members 13. The supporting members 13 are carriedon the stringers 14, which are supported in turn on the false workbeyond and clear of the ends of the pans. It will be seen frominspection of Figure 2 that the pans 7 are supported from the members 13through the medium of the ties 11 and that the channel members 9 arealso supported from the members 18 through the medium of the blocks 10.The joist load is therefore directly transmitted to the members 13 andthe only load supported by the pans 7 is that of the floor slabs. Sincethe floor slabs are relatively thin, the load is not great and it may besafely taken up by the pans themselves if the latter are supported byasuitable number of the ties 11. It will also, be noted that the blocks10 serve as spreaders,- preventing the bottom portions of the pans frombeing pinched in by the ties 11.

The space between the ends of the pans is closed by stretcher members16, which are preferably in the form of channels lapping the ends ofadjacent fillers 9, and

by the cover plates 17, which conform to the shape of the pans. Thesecover plates extend downwardly between the sides of the pans and thefillers 9, in which connection it is to be observed that the coverplates are made of thin sheet metal, making it possible to dispose theparts in'this manner Without bringing them out of alinement. In thedrawing the thickness of the sheet metal plate is exaggerated for thepurpose of clarity. The stretehers are supported by the stringers 18,which may be wedged 0r blocked up if necessary.

By the arrangement just described I am enabled to take down the panswithinabout 24 hours after the concrete has been poured, the concretebeing sufficiently supported by the filler members 9 and thestretcherslti which are left in position until the concrete isthoroughly set. The pans are thus made available for further use.

In taking down the form, the keys 12 are driven out and the ties 11removed, after which the pans may be dropped directly down, thearrangement of the stringers and shoring being such as to present noobstacle to this operation. i Attention is now directed to theconstruction shown in Figures 3 to 6 inclusive. In this construction thepans 7, instead of being supported from the members 13 through-themedium of the ties 11, are supported directly from stringers 19 carriedon the shoring. The flanges 8, in this case, rest directly on thestringers l9, and may be turned in orout. The bottom of the joists ismolded by filler members which maybe of the construction previouslydescribed or may be composed of wooden boards 9. The filler members aresupported on the ties 11, and if desired, they may be provided atsuitable intervals intermediate the ties 11 with blocks 20, which alsoserve in conjunction with the filler members as spreaders against whichthe sides of the pan 7 are clamped by the ties.

The gap between the pans is closed by stretcher members, which in thisinstance are preferably in the form of sheet metal plates16',overlapping the adjacent ends of the fillers 9; and by the coverplates 17, which, as before, extend down between the sides of the pansand the filler members 9'. The stretchers are supported by stringers 18.

The fillers 9' can be adjusted in elevation to suit varying depths ofjoists, by substituting for the blocks 20 shown in Figures 3,

4 and 5, other blocks 20 of greater depth as shown for example in Figure'6, and in the construction shown in Figures 1 and 2 this result may beachieved by inverting-the channels 9, for example.

The construction shown in Figures 3 to 6 inclusive, while not having theadvantage of making it, possible to take down the pans 7 at an earlystage of the operation, as is the ease with the structure shown inFigures 1 and 2, is equally simple in other respects for the reason thatthe pans 7 are self supportingand the intermediate supporting mechanismordinarily employed is eliminated. It is to be observed that while thepans serve to support the bottom of the joist mold through the medium ofthe ties and thus eliminate the need for any intermediate supportingmechanism, the load is taken at the bottom of the pans and in factalmost directly by the flanges 8, which are supported on the stringers,from which it will be seen that the pans are not subjected to markedload thrusts, such as cannot be adequately withstood by the thin sheetsteel from which the pans are ordinarily made.

From the foregoing it will be apparent that the pan mechanism is soconstructed that I am enabled to support it in either of two ways,namely directly on the sides of the pans themselves, in which case thepans are not taken down immediately, or indirectly through the medium ofthe ties 11, in which case the pans may be taken down at an early stage.Also it is possible to support the fillers for the bottom of the joistsdirectly on the flanged bottoms of the pans, or resting on the ties, asa result of which a wide variation in depth of joists can be met with aminimum number. of parts. In this connection, when channels are used asfillers, a further range of adjustment is provided by virtue of the factthat the channels may be supported either face up on the ties or onblocks carried by the pans.

I claim:

1. A mold form foriconcrete joist floors and the like comprising incombination a plurality of pans, the sides of which forming the joistmold are spaced apart and flanged at the bottom, filler means betweenthe sides forming the bottom of the joist mold, and means below saidfiller means extending between and engaging the sides above saidflanges, so that the filler means may be supported either independentlythrough such last mentioned means or from the pan flanges. and the sidesmay be supported either directly or through the medium of such lastmentioned means.

2. A mold form for concrete joist floors and the like comprising aplurality of pans with flanged sides for forming the joist moldapertured just above their flanges, filler means between said sidesforming the bottom of the joist mold, and ties for preventing spreadingof said sides extending through their apertures below said filler means.

3. A mold form for concrete joist floors and the like comprising aplurality of pans with flanged sides for forming the joist moldvertically slotted just above their flanges, filler means between saidsides forming the bottom of the joist mold, and tie plates extendingthrough the pan slots aforesaid below said filler means.

4. The combination-in a concrete joist floor mold or the like of aplurality of pans, filler means between the sides of adjacent pansforming the bottom of the joist mold, said sides being provided with aplurality of apertures below the filler means, and a plurality of tiesextending through the apertures in adjacent sides, said filler meanscomprising a channel capable of bein supported on said ties either faceup, an said sides having outwardly projecting portions, so that thefiller means may be supported therefrom.

5. The combination in a concrete joist floor mold or the like of aplurality of pans, filler means between the sides of adjacent pansforming the bottom of the joist mold, means extending longitudinally ofthe pan for supporting the filler means independ ently of the pans, andmeans beyond and clear of the ends of the pans for supporting saidfiller supporting means, so that the pans may be directly dropped.

6. The. combination in a concrete 'oist floor or the like of a pluralityof pans, ler means between the sides of adjacent pans forming the bottomof the joist mold, means extending longitudinally of the pans forsupporting the filler means independently of the pans, means forsupporting the pans from said longitudinally extending fillersupportingmeans, and means beyond and clear of the ends of the pans forsupporting said filler supporting means, so that the pans'may bedirectly dropped.

In testimony whereof, I have hereunto signed my name.

NILS F. AMBURSEN.

